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On that day, I also encountered this symptom.Can I able to avoid this problem by connecting to a node other than Hong Kong?I heard that I can connect to another node by log in as "test@test.com_SRV_*.* .*. *".

It is possible to force an Icon to register to a specific node (see link below) but not the apps. In the case of November 1, 2017 the Hong Kong registration server was online but experienced an issue with new registrations. Once the issue was known it was removed from service which would have sent new requests to the next best server (all 19 nodes are probed upon boot up or login in and a decision made based on ping response time and server load). When the Hong Kong server issue was resolved it was put back into service.